21137936061 has 32 divisors (see below), whose sum is σ = 31225747968. Its totient is φ = 12611269440.

The previous prime is 21137936041. The next prime is 21137936081. The reversal of 21137936061 is 16063973112.

It is an interprime number because it is at equal distance from previous prime (21137936041) and next prime (21137936081).

It is not a de Polignac number, because 21137936061 - 2¹⁸ = 21137673917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21137936041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5386246 + ... + 5390168.

It is an arithmetic number, because the mean of its divisors is an integer number (975804624).

Almost surely, 2^21137936061 is an apocalyptic number.

It is an amenable number.

21137936061 is a deficient number, since it is larger than the sum of its proper divisors (10087811907).

21137936061 is a wasteful number, since it uses less digits than its factorization.

21137936061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6441.

The product of its (nonzero) digits is 40824, while the sum is 39.

The spelling of 21137936061 in words is "twenty-one billion, one hundred thirty-seven million, nine hundred thirty-six thousand, sixty-one".