20521412555 has 32 divisors (see below), whose sum is σ = 31367554560. Its totient is φ = 12547008000.

The previous prime is 20521412543. The next prime is 20521412609. The reversal of 20521412555 is 55521412502.

It is a happy number.

It is not a de Polignac number, because 20521412555 - 2⁸ = 20521412299 is a prime.

It is a super-2 number, since 2×20521412555² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 896321 + ... + 918930.

It is an arithmetic number, because the mean of its divisors is an integer number (980236080).

Almost surely, 2^20521412555 is an apocalyptic number.

20521412555 is a deficient number, since it is larger than the sum of its proper divisors (10846142005).

20521412555 is a wasteful number, since it uses less digits than its factorization.

20521412555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1815299.

The product of its (nonzero) digits is 20000, while the sum is 32.

The spelling of 20521412555 in words is "twenty billion, five hundred twenty-one million, four hundred twelve thousand, five hundred fifty-five".