2021026631261 has 16 divisors (see below), whose sum is σ = 2206236650688. Its totient is φ = 1836063753600.

The previous prime is 2021026631257. The next prime is 2021026631363. The reversal of 2021026631261 is 1621366201202.

It is a cyclic number.

It is not a de Polignac number, because 2021026631261 - 2² = 2021026631257 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 (2021026631201) 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, 166924370 + ... + 166936476.

It is an arithmetic number, because the mean of its divisors is an integer number (137889790668).

Almost surely, 2^{2021026631261} is an apocalyptic number.

It is an amenable number.

2021026631261 is a deficient number, since it is larger than the sum of its proper divisors (185210019427).

2021026631261 is a wasteful number, since it uses less digits than its factorization.

2021026631261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21052.

The product of its (nonzero) digits is 10368, while the sum is 32.

The spelling of 2021026631261 in words is "two trillion, twenty-one billion, twenty-six million, six hundred thirty-one thousand, two hundred sixty-one".