21250420402101 has 32 divisors (see below), whose sum is σ = 31223987464320. Its totient is φ = 12748157952000.

The previous prime is 21250420402097. The next prime is 21250420402139. The reversal of 21250420402101 is 10120402405212.

It is not a de Polignac number, because 21250420402101 - 2² = 21250420402097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21250420402171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11801605 + ... + 13482533.

It is an arithmetic number, because the mean of its divisors is an integer number (975749608260).

Almost surely, 2^{21250420402101} is an apocalyptic number.

It is an amenable number.

21250420402101 is a deficient number, since it is larger than the sum of its proper divisors (9973567062219).

21250420402101 is a wasteful number, since it uses less digits than its factorization.

21250420402101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1684837.

The product of its (nonzero) digits is 1280, while the sum is 24.

Adding to 21250420402101 its reverse (10120402405212), we get a palindrome (31370822807313).

The spelling of 21250420402101 in words is "twenty-one trillion, two hundred fifty billion, four hundred twenty million, four hundred two thousand, one hundred one".