21024213331 has 16 divisors (see below), whose sum is σ = 23635680768. Its totient is φ = 18535028800.

The previous prime is 21024213277. The next prime is 21024213337. The reversal of 21024213331 is 13331242012.

It is a cyclic number.

It is not a de Polignac number, because 21024213331 - 2²⁹ = 20487342419 is a prime.

It is a super-2 number, since 2×21024213331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21024213337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64255 + ... + 214888.

It is an arithmetic number, because the mean of its divisors is an integer number (1477230048).

Almost surely, 2^21024213331 is an apocalyptic number.

21024213331 is a deficient number, since it is larger than the sum of its proper divisors (2611467437).

21024213331 is a wasteful number, since it uses less digits than its factorization.

21024213331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279362.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21024213331 its reverse (13331242012), we get a palindrome (34355455343).

The spelling of 21024213331 in words is "twenty-one billion, twenty-four million, two hundred thirteen thousand, three hundred thirty-one".