2142102421 has 2 divisors, whose sum is σ = 2142102422. Its totient is φ = 2142102420.

The previous prime is 2142102377. The next prime is 2142102461. The reversal of 2142102421 is 1242012412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1470722500 + 671379921 = 38350^2 + 25911^2 .

It is a cyclic number.

It is not a de Polignac number, because 2142102421 - 2⁷ = 2142102293 is a prime.

It is a super-2 number, since 2×2142102421² = 9177205564108122482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2142102461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071051210 + 1071051211.

It is an arithmetic number, because the mean of its divisors is an integer number (1071051211).

Almost surely, 2^2142102421 is an apocalyptic number.

It is an amenable number.

2142102421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2142102421 is an equidigital number, since it uses as much as digits as its factorization.

2142102421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 2142102421 is about 46282.8523429574. The cubic root of 2142102421 is about 1289.0806142623.

Adding to 2142102421 its reverse (1242012412), we get a palindrome (3384114833).

Subtracting from 2142102421 its reverse (1242012412), we obtain a palindrome (900090009).

The spelling of 2142102421 in words is "two billion, one hundred forty-two million, one hundred two thousand, four hundred twenty-one".