32155551420021 has 24 divisors (see below), whose sum is σ = 48900322667040. Its totient is φ = 20305096912800.

The previous prime is 32155551419987. The next prime is 32155551420131. The reversal of 32155551420021 is 12002415555123.

32155551420021 is a `hidden beast` number, since 32 + 1 + 55 + 551 + 4 + 2 + 0 + 0 + 21 = 666.

It is not a de Polignac number, because 32155551420021 - 2¹³ = 32155551411829 is a prime.

It is a super-2 number, since 2×32155551420021² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (32155551420221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16053310 + ... + 17944911.

It is an arithmetic number, because the mean of its divisors is an integer number (2037513444460).

Almost surely, 2^{32155551420021} is an apocalyptic number.

It is an amenable number.

32155551420021 is a deficient number, since it is larger than the sum of its proper divisors (16744771247019).

32155551420021 is a wasteful number, since it uses less digits than its factorization.

32155551420021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34003777 (or 34003774 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

Adding to 32155551420021 its reverse (12002415555123), we get a palindrome (44157966975144).

The spelling of 32155551420021 in words is "thirty-two trillion, one hundred fifty-five billion, five hundred fifty-one million, four hundred twenty thousand, twenty-one".