21077149015 has 16 divisors (see below), whose sum is σ = 28840408128. Its totient is φ = 14649094656.

The previous prime is 21077149001. The next prime is 21077149033. The reversal of 21077149015 is 51094177012.

It is a cyclic number.

It is not a de Polignac number, because 21077149015 - 2¹¹ = 21077146967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9536067 + ... + 9538276.

It is an arithmetic number, because the mean of its divisors is an integer number (1802525508).

Almost surely, 2^21077149015 is an apocalyptic number.

21077149015 is a deficient number, since it is larger than the sum of its proper divisors (7763259113).

21077149015 is a wasteful number, since it uses less digits than its factorization.

21077149015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19074378.

The product of its (nonzero) digits is 17640, while the sum is 37.

The spelling of 21077149015 in words is "twenty-one billion, seventy-seven million, one hundred forty-nine thousand, fifteen".