21142203231 has 16 divisors (see below), whose sum is σ = 28291000320. Its totient is φ = 14044166400.

The previous prime is 21142203179. The next prime is 21142203301. The reversal of 21142203231 is 13230224112.

It is not a de Polignac number, because 21142203231 - 2¹⁵ = 21142170463 is a prime.

It is a super-2 number, since 2×21142203231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21142203198 and 21142203207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142203031) 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, 1529730 + ... + 1543488.

It is an arithmetic number, because the mean of its divisors is an integer number (1768187520).

Almost surely, 2^21142203231 is an apocalyptic number.

21142203231 is a deficient number, since it is larger than the sum of its proper divisors (7148797089).

21142203231 is a wasteful number, since it uses less digits than its factorization.

21142203231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15566.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21142203231 its reverse (13230224112), we get a palindrome (34372427343).

The spelling of 21142203231 in words is "twenty-one billion, one hundred forty-two million, two hundred three thousand, two hundred thirty-one".