10721556 has 36 divisors (see below), whose sum is σ = 27203904. Its totient is φ = 3560400.

The previous prime is 10721549. The next prime is 10721569. The reversal of 10721556 is 65512701.

10721556 is a `hidden beast` number, since 107 + 2 + 1 + 556 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×10721556² = 229903526122272, which contains 22 as substring.

It is a congruent 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, 15171 + ... + 15861.

It is an arithmetic number, because the mean of its divisors is an integer number (755664).

Almost surely, 2^10721556 is an apocalyptic number.

It is an amenable number.

10721556 is an abundant number, since it is smaller than the sum of its proper divisors (16482348).

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

10721556 is a wasteful number, since it uses less digits than its factorization.

10721556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132 (or 1127 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 10721556 is about 3274.3787196963. The cubic root of 10721556 is about 220.5054219902.

It can be divided in two parts, 1072 and 1556, that added together give a triangular number (2628 = T₇₂).

The spelling of 10721556 in words is "ten million, seven hundred twenty-one thousand, five hundred fifty-six".