21010156077 has 8 divisors (see below), whose sum is σ = 28014280416. Its totient is φ = 14006401232.

The previous prime is 21010156049. The next prime is 21010156087. The reversal of 21010156077 is 77065101012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21010156077 - 2¹⁴ = 21010139693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010156087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94063 + ... + 225539.

It is an arithmetic number, because the mean of its divisors is an integer number (3501785052).

Almost surely, 2^21010156077 is an apocalyptic number.

It is an amenable number.

21010156077 is a deficient number, since it is larger than the sum of its proper divisors (7004124339).

21010156077 is a wasteful number, since it uses less digits than its factorization.

21010156077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184747.

The product of its (nonzero) digits is 2940, while the sum is 30.

Adding to 21010156077 its reverse (77065101012), we get a palindrome (98075257089).

The spelling of 21010156077 in words is "twenty-one billion, ten million, one hundred fifty-six thousand, seventy-seven".