20311011201021 has 16 divisors (see below), whose sum is σ = 27320689355904. Its totient is φ = 13421462979584.

The previous prime is 20311011201017. The next prime is 20311011201071. The reversal of 20311011201021 is 12010211011302.

It is a cyclic number.

It is not a de Polignac number, because 20311011201021 - 2² = 20311011201017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311011201001) 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, 57246576 + ... + 57600281.

It is an arithmetic number, because the mean of its divisors is an integer number (1707543084744).

Almost surely, 2^{20311011201021} is an apocalyptic number.

It is an amenable number.

20311011201021 is a deficient number, since it is larger than the sum of its proper divisors (7009678154883).

20311011201021 is a wasteful number, since it uses less digits than its factorization.

20311011201021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114847380.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 20311011201021 its reverse (12010211011302), we get a palindrome (32321222212323).

The spelling of 20311011201021 in words is "twenty trillion, three hundred eleven billion, eleven million, two hundred one thousand, twenty-one".