21150015432031 has 16 divisors (see below), whose sum is σ = 22301333641440. Its totient is φ = 20002516531200.

The previous prime is 21150015432023. The next prime is 21150015432131. The reversal of 21150015432031 is 13023451005112.

It is a cyclic number.

It is not a de Polignac number, because 21150015432031 - 2³ = 21150015432023 is a prime.

It is a super-2 number, since 2×21150015432031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150015432131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332866341 + ... + 332929873.

It is an arithmetic number, because the mean of its divisors is an integer number (1393833352590).

Almost surely, 2^{21150015432031} is an apocalyptic number.

21150015432031 is a deficient number, since it is larger than the sum of its proper divisors (1151318209409).

21150015432031 is a wasteful number, since it uses less digits than its factorization.

21150015432031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93306.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 21150015432031 its reverse (13023451005112), we get a palindrome (34173466437143).

The spelling of 21150015432031 in words is "twenty-one trillion, one hundred fifty billion, fifteen million, four hundred thirty-two thousand, thirty-one".