21054652225 has 12 divisors (see below), whose sum is σ = 26714927536. Its totient is φ = 16452006480.

The previous prime is 21054652207. The next prime is 21054652243. The reversal of 21054652225 is 52225645012.

It is an interprime number because it is at equal distance from previous prime (21054652207) and next prime (21054652243).

It is not a de Polignac number, because 21054652225 - 2⁷ = 21054652097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9791787 + ... + 9793936.

Almost surely, 2^21054652225 is an apocalyptic number.

21054652225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21054652225 is a deficient number, since it is larger than the sum of its proper divisors (5660275311).

21054652225 is a wasteful number, since it uses less digits than its factorization.

21054652225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19585776 (or 19585771 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

The spelling of 21054652225 in words is "twenty-one billion, fifty-four million, six hundred fifty-two thousand, two hundred twenty-five".