202123021031 has 4 divisors (see below), whose sum is σ = 202138290000. Its totient is φ = 202107752064.

The previous prime is 202123020971. The next prime is 202123021091. The reversal of 202123021031 is 130120321202.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (202123020971) and next prime (202123021091).

It is a cyclic number.

It is not a de Polignac number, because 202123021031 - 2²² = 202118826727 is a prime.

It is a super-2 number, since 2×202123021031² (a number of 23 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 (202123021091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7614611 + ... + 7641108.

It is an arithmetic number, because the mean of its divisors is an integer number (50534572500).

Almost surely, 2^202123021031 is an apocalyptic number.

202123021031 is a deficient number, since it is larger than the sum of its proper divisors (15268969).

202123021031 is a wasteful number, since it uses less digits than its factorization.

202123021031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15268968.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 202123021031 its reverse (130120321202), we get a palindrome (332243342233).

The spelling of 202123021031 in words is "two hundred two billion, one hundred twenty-three million, twenty-one thousand, thirty-one".