21641112142402 has 4 divisors (see below), whose sum is σ = 32461668213606. Its totient is φ = 10820556071200.

The previous prime is 21641112142369. The next prime is 21641112142457. The reversal of 21641112142402 is 20424121114612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16306485820641 + 5334626321761 = 4038129^2 + 2309681^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5410278035599 + ... + 5410278035602.

Almost surely, 2^{21641112142402} is an apocalyptic number.

21641112142402 is a deficient number, since it is larger than the sum of its proper divisors (10820556071204).

21641112142402 is a wasteful number, since it uses less digits than its factorization.

21641112142402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10820556071203.

The product of its (nonzero) digits is 6144, while the sum is 31.

The spelling of 21641112142402 in words is "twenty-one trillion, six hundred forty-one billion, one hundred twelve million, one hundred forty-two thousand, four hundred two".