21653051420402 has 4 divisors (see below), whose sum is σ = 32479577130606. Its totient is φ = 10826525710200.

The previous prime is 21653051420393. The next prime is 21653051420461. The reversal of 21653051420402 is 20402415035612.

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., 13902167130721 + 7750884289681 = 3728561^2 + 2784041^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5413262855099 + ... + 5413262855102.

Almost surely, 2^{21653051420402} is an apocalyptic number.

21653051420402 is a deficient number, since it is larger than the sum of its proper divisors (10826525710204).

21653051420402 is a wasteful number, since it uses less digits than its factorization.

21653051420402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10826525710203.

The product of its (nonzero) digits is 57600, while the sum is 35.

The spelling of 21653051420402 in words is "twenty-one trillion, six hundred fifty-three billion, fifty-one million, four hundred twenty thousand, four hundred two".