21254764150546 has 4 divisors (see below), whose sum is σ = 31882146225822. Its totient is φ = 10627382075272.

The previous prime is 21254764150507. The next prime is 21254764150583. The reversal of 21254764150546 is 64505146745212.

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., 13761213771321 + 7493550379225 = 3709611^2 + 2737435^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21254764150493 and 21254764150502.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5313691037635 + ... + 5313691037638.

Almost surely, 2^{21254764150546} is an apocalyptic number.

21254764150546 is a deficient number, since it is larger than the sum of its proper divisors (10627382075276).

21254764150546 is a wasteful number, since it uses less digits than its factorization.

21254764150546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10627382075275.

The product of its (nonzero) digits is 8064000, while the sum is 52.

The spelling of 21254764150546 in words is "twenty-one trillion, two hundred fifty-four billion, seven hundred sixty-four million, one hundred fifty thousand, five hundred forty-six".