1211223021 has 8 divisors (see below), whose sum is σ = 1709961984. Its totient is φ = 759983040.

The previous prime is 1211222989. The next prime is 1211223037. The reversal of 1211223021 is 1203221121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211223021 - 2⁵ = 1211222989 is a prime.

It is a super-2 number, since 2×1211223021² = 2934122413200732882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211223061) 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, 11874685 + ... + 11874786.

It is an arithmetic number, because the mean of its divisors is an integer number (213745248).

Almost surely, 2^1211223021 is an apocalyptic number.

It is an amenable number.

1211223021 is a deficient number, since it is larger than the sum of its proper divisors (498738963).

1211223021 is a wasteful number, since it uses less digits than its factorization.

1211223021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23749491.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1211223021 is about 34802.6295127250. The cubic root of 1211223021 is about 1065.9611389889.

Adding to 1211223021 its reverse (1203221121), we get a palindrome (2414444142).

The spelling of 1211223021 in words is "one billion, two hundred eleven million, two hundred twenty-three thousand, twenty-one".