21383217025 has 24 divisors (see below), whose sum is σ = 28437376320. Its totient is φ = 15900431040.

The previous prime is 21383216977. The next prime is 21383217061. The reversal of 21383217025 is 52071238312.

It is not a de Polignac number, because 21383217025 - 2¹⁵ = 21383184257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 399517 + ... + 449866.

It is an arithmetic number, because the mean of its divisors is an integer number (1184890680).

Almost surely, 2^21383217025 is an apocalyptic number.

21383217025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21383217025 is a deficient number, since it is larger than the sum of its proper divisors (7054159295).

21383217025 is a wasteful number, since it uses less digits than its factorization.

21383217025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849465 (or 849460 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 21383217025 in words is "twenty-one billion, three hundred eighty-three million, two hundred seventeen thousand, twenty-five".