21054625552 has 10 divisors (see below), whose sum is σ = 40793337038. Its totient is φ = 10527312768.

The previous prime is 21054625547. The next prime is 21054625567. The reversal of 21054625552 is 25552645012.

It can be written as a sum of positive squares in only one way, i.e., 20977466896 + 77158656 = 144836^2 + 8784^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657957033 + ... + 657957064.

Almost surely, 2^21054625552 is an apocalyptic number.

It is an amenable number.

21054625552 is a deficient number, since it is larger than the sum of its proper divisors (19738711486).

21054625552 is a wasteful number, since it uses less digits than its factorization.

21054625552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315914105 (or 1315914099 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 37.

The spelling of 21054625552 in words is "twenty-one billion, fifty-four million, six hundred twenty-five thousand, five hundred fifty-two".