31520014522421 has 16 divisors (see below), whose sum is σ = 33298191538560. Its totient is φ = 29753832775680.

The previous prime is 31520014522417. The next prime is 31520014522427. The reversal of 31520014522421 is 12422541002513.

It is not a de Polignac number, because 31520014522421 - 2² = 31520014522417 is a prime.

It is a super-2 number, since 2×31520014522421² (a number of 28 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 (31520014522427) 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, 14696405 + ... + 16704021.

It is an arithmetic number, because the mean of its divisors is an integer number (2081136971160).

Almost surely, 2^{31520014522421} is an apocalyptic number.

It is an amenable number.

31520014522421 is a deficient number, since it is larger than the sum of its proper divisors (1778177016139).

31520014522421 is a wasteful number, since it uses less digits than its factorization.

31520014522421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2010604.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 31520014522421 its reverse (12422541002513), we get a palindrome (43942555524934).

The spelling of 31520014522421 in words is "thirty-one trillion, five hundred twenty billion, fourteen million, five hundred twenty-two thousand, four hundred twenty-one".