21242220431052 has 24 divisors (see below), whose sum is σ = 49632251636800. Its totient is φ = 7071158624976.

The previous prime is 21242220431041. The next prime is 21242220431059. The reversal of 21242220431052 is 25013402224212.

It is not an unprimeable number, because it can be changed into a prime (21242220431059) 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, 1197680602 + ... + 1197698337.

Almost surely, 2^{21242220431052} is an apocalyptic number.

It is an amenable number.

21242220431052 is an abundant number, since it is smaller than the sum of its proper divisors (28390031205748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21242220431052 is a wasteful number, since it uses less digits than its factorization.

21242220431052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2395379685 (or 2395379683 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 21242220431052 its reverse (25013402224212), we get a palindrome (46255622655264).

The spelling of 21242220431052 in words is "twenty-one trillion, two hundred forty-two billion, two hundred twenty million, four hundred thirty-one thousand, fifty-two".