401525122021 has 16 divisors (see below), whose sum is σ = 436352227840. Its totient is φ = 368070816960.

The previous prime is 401525122007. The next prime is 401525122081. The reversal of 401525122021 is 120221525104.

It is not a de Polignac number, because 401525122021 - 2²⁷ = 401390904293 is a prime.

It is a super-2 number, since 2×401525122021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (401525122081) 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, 4629571 + ... + 4715503.

It is an arithmetic number, because the mean of its divisors is an integer number (27272014240).

Almost surely, 2^401525122021 is an apocalyptic number.

It is an amenable number.

401525122021 is a deficient number, since it is larger than the sum of its proper divisors (34827105819).

401525122021 is a wasteful number, since it uses less digits than its factorization.

401525122021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93916.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 401525122021 its reverse (120221525104), we get a palindrome (521746647125).

The spelling of 401525122021 in words is "four hundred one billion, five hundred twenty-five million, one hundred twenty-two thousand, twenty-one".