21235402491852 has 48 divisors (see below), whose sum is σ = 50185070208000. Its totient is φ = 6987669936000.

The previous prime is 21235402491769. The next prime is 21235402491859. The reversal of 21235402491852 is 25819420453212.

It is not an unprimeable number, because it can be changed into a prime (21235402491859) 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, 3629977 + ... + 7459727.

It is an arithmetic number, because the mean of its divisors is an integer number (1045522296000).

Almost surely, 2^{21235402491852} is an apocalyptic number.

It is an amenable number.

21235402491852 is an abundant number, since it is smaller than the sum of its proper divisors (28949667716148).

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

21235402491852 is a wasteful number, since it uses less digits than its factorization.

21235402491852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3835686 (or 3835684 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 21235402491852 in words is "twenty-one trillion, two hundred thirty-five billion, four hundred two million, four hundred ninety-one thousand, eight hundred fifty-two".