21162116437 has 64 divisors (see below), whose sum is σ = 28569231360. Its totient is φ = 15181689600.

The previous prime is 21162116429. The next prime is 21162116461. The reversal of 21162116437 is 73461126112.

It is not a de Polignac number, because 21162116437 - 2³ = 21162116429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21162116407) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32407203 + ... + 32407855.

It is an arithmetic number, because the mean of its divisors is an integer number (446394240).

Almost surely, 2^21162116437 is an apocalyptic number.

It is an amenable number.

21162116437 is a deficient number, since it is larger than the sum of its proper divisors (7407114923).

21162116437 is a wasteful number, since it uses less digits than its factorization.

21162116437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354.

The product of its digits is 12096, while the sum is 34.

The spelling of 21162116437 in words is "twenty-one billion, one hundred sixty-two million, one hundred sixteen thousand, four hundred thirty-seven".