21072954 has 32 divisors (see below), whose sum is σ = 48453120. Its totient is φ = 5985072.

The previous prime is 21072923. The next prime is 21072973. The reversal of 21072954 is 45927012.

It is a super-2 number, since 2×21072954² = 888138780572232, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6117 + ... + 8919.

It is an arithmetic number, because the mean of its divisors is an integer number (1514160).

Almost surely, 2^21072954 is an apocalyptic number.

21072954 is an abundant number, since it is smaller than the sum of its proper divisors (27380166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21072954 is a wasteful number, since it uses less digits than its factorization.

21072954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 21072954 is about 4590.5287277175. The cubic root of 21072954 is about 276.2115318083.

Adding to 21072954 its reverse (45927012), we get a palindrome (66999966).

The spelling of 21072954 in words is "twenty-one million, seventy-two thousand, nine hundred fifty-four".