21290897010436 has 9 divisors (see below), whose sum is σ = 37259085917991. Its totient is φ = 10645443891012.

The previous prime is 21290897010319. The next prime is 21290897010469. The reversal of 21290897010436 is 63401079809212.

The square root of 21290897010436 is 4614206.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8074861 + ... + 10381963.

Almost surely, 2^{21290897010436} is an apocalyptic number.

21290897010436 is the 4614206-th square number.

It is an amenable number.

21290897010436 is a deficient number, since it is larger than the sum of its proper divisors (15968188907555).

21290897010436 is an frugal number, since it uses more digits than its factorization.

21290897010436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4614210 (or 2307105 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 21290897010436 in words is "twenty-one trillion, two hundred ninety billion, eight hundred ninety-seven million, ten thousand, four hundred thirty-six".