21276542 has 16 divisors (see below), whose sum is σ = 38394240. Its totient is φ = 8638488.

The previous prime is 21276491. The next prime is 21276547. The reversal of 21276542 is 24567212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21276547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39728 + ... + 40259.

It is an arithmetic number, because the mean of its divisors is an integer number (2399640).

Almost surely, 2^21276542 is an apocalyptic number.

21276542 is a deficient number, since it is larger than the sum of its proper divisors (17117698).

21276542 is a wasteful number, since it uses less digits than its factorization.

21276542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80015.

The product of its digits is 6720, while the sum is 29.

The square root of 21276542 is about 4612.6502143562. The cubic root of 21276542 is about 277.0981853359.

The spelling of 21276542 in words is "twenty-one million, two hundred seventy-six thousand, five hundred forty-two".